[petsc-dev] Matlab implementation of PC

[Barry Smith]

On Dec 9, 2010, at 3:52 PM, Dave May wrote:

> Ok, after digging a little bit more, I realise I can configure the pc
> in a command line like
> manner using this syntax '-pc_type','lu'.
> 
> What I was hoping to use was ML and hypre, however it appears neither
> of these libraries can be built with --with-mpi=0, which seems to be a
> requirement when calling petsc from matlab.
> Is there a straight forward way to enable hypre and ml to be used when
> --with-mpi=0?

No. I won't recommend monkeying with that. 

A much better way to do it would be to "improve" the Matlab interface to support running under MPI; first step of course just sequential (one process MPI). 

This would be done by putting a PETSC_COMM_SELF field into PetscObject as a nonconstant property and then have PetscInitalize.m pull the PETSC_COMM_SELF up from C and put it into PetscObject. Then calls to, for example, KSPCreate() from Matlab would automatically pass that property in (currently they just pass 0 in, which works for MPI Uni).

   Barry

> 
> Cheers,
>  Dave
> 
> 
> 
> 
> On 9 December 2010 22:26, Dave May <dave.mayhem23 at gmail.com> wrote:
>> Hi Barry,
>>  Is it possible that you could possible add PetscPC.m?
>> I work with a bunch of matlab users solving Stokes on staggered grid who
>> rely on umfpack. I'd love to be able to get them to try ML or hypre via PETSc.
>> 
>> Cheers,
>>  Dave
>>